CVE-2021-47192

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Source
https://nvd.nist.gov/vuln/detail/CVE-2021-47192
Import Source
https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2021-47192.json
JSON Data
https://api.osv.dev/v1/vulns/CVE-2021-47192
Related
Published
2024-04-10T19:15:47Z
Modified
2024-09-18T03:17:22.195916Z
Summary
[none]
Details

In the Linux kernel, the following vulnerability has been resolved:

scsi: core: sysfs: Fix hang when device state is set via sysfs

This fixes a regression added with:

commit f0f82e2476f6 ("scsi: core: Fix capacity set to zero after offlinining device")

The problem is that after iSCSI recovery, iscsid will call into the kernel to set the dev's state to running, and with that patch we now call scsirescandevice() with the statemutex held. If the SCSI error handler thread is just starting to test the device in scsisendehcmnd() then it's going to try to grab the state_mutex.

We are then stuck, because when scsirescandevice() tries to send its I/O scsiqueuerq() calls -> scsihostqueueready() -> scsihostinrecovery() which will return true (the host state is still in recovery) and I/O will just be requeued. scsisendehcmnd() will then never be able to grab the statemutex to finish error handling.

To prevent the deadlock move the rescan-related code to after we drop the state_mutex.

This also adds a check for if we are already in the running state. This prevents extra scans and helps the iscsid case where if the transport class has already onlined the device during its recovery process then we don't need userspace to do it again plus possibly block that daemon.

References

Affected packages

Debian:11 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.10.84-1

Affected versions

5.*

5.10.46-4
5.10.46-5
5.10.70-1~bpo10+1
5.10.70-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:12 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.5-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}

Debian:13 / linux

Package

Name
linux
Purl
pkg:deb/debian/linux?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
5.15.5-1

Ecosystem specific

{
    "urgency": "not yet assigned"
}